formats and to provide APIs for data access that evolve based on the storage system's understanding of the data. Fay Chang et al. (2006) Bigtable: A Distributed Storage System for Structured Data, Google. Robert Kallman et al. (2008) H-store: a high-performance, distributed main memory transaction processing system See also Apache Accumulo – Secure Bigtable Apache Cassandra, a column-oriented database that supports access from Hadoop Apache CouchDB, a database that uses JSON for documents, JavaScript for MapReduce queries, and regular HTTP for an API Apache HCatalog, a table and storage management layer for Hadoop Big data Data Intensive Computing HPCC – LexisNexis Risk Solutions High Performance Computing Cluster Hypertable – HBase alternative Sector/Sphere – Open source distributed storage and processing Simple Linux Utility for Resource Management References Bibliography External links Hadoop Big data products Distributed file systems Free software for cloud computing Free software programmed in Java (programming language) Free system software Software using the Apache license